Improvement in shingle-sawing machines



NITED STATES PATENT y OFFICE.

CHARLES L. PIERCE, OF- BUFFALO, NEW YORK. 1

IMPROVEMENT IN SHINGLE-SAWING MACHINES.

Specification forming part of Letters Patent No. 47,449, dated April 25,1865.

To all whom t may concern,.-

Beit known that I, CHARLES L. Pinnen, of the city of Buffa-lo, county ofErie, and State of N ew York, have invented a certain new and usefulImprovement in Dogs for Holding Shingle-Blocks; and I do hereby declarethat the followin g is afull, clear, and exact Fig. III is across-section on line A B. Fig.

1V is an elevation of one pair of dogs and operatin g-screw. Fig. V is acrosssecticn of one ot' the dogs, showing their beveled or knife edge.

The nature of this invention consists in the combination oftwo pair ofdogs with the reciprocating table, by which the block or bolt77 iscarried to and from the saw, said dogs being so arranged as to clamp theblock above and below in such a manner that as the block is cut by thesaw, one pair of dogs will hold the block upon one side of thesaw"`kert` or cut and the other pair will hold the block upon the otherside of the saw-kerf, whereby the block as itis cut hy the saw isprevented from springing together and pinching the saw.

Letters of like name and kind refer to like parts in each of thefigures.

This invention is designed for use in connection with the machine forsawing shinglebolts, for which Letters Patent No. 42,505, dated April26, 1864, were granted to me, and is described in the said patent andrepresented in the model and drawings thereof, but is not claimed; butit is obviously adapted to other machines for like or similar purposes.

A represents the reciprocating table, or a portion of it, upon which theblock to be sawed into bolts is placed. This table is constructed (asdescribtd in the above-mentioned patent) of two planks, one on each sideof the saw, leaving a longitudinal slit or opening, 0.', up throughwhich the saw projects. The two planks are connected together by arch edstandards, which straddle the saw as they pass over it in thereciprocating motion of the table.

B represents the front standard, which car ries the clamping-dogs.

C G represent the dogs by which the block is held, C representing thelower and C the upper dogs.

D D representthe clamping-screws bywhich the dogs are drawn together totake hold of the blocks. They are each placed vertically within eitherleg of the standard B and on either side of "the saw, said standardbeing constructed with lateral ribs in a manner to form recesses for theproper reception of said screws. (See specially Fig. III.)

The lower dogs are formed with righi-.angled shanks c2, bored to receivethe lower ends of the clamping-screws, which have journals turned onthem, allowing them to turn freely in the shank, the dogs being heldlongitudinally by a `shoulder on the screw above and hy a pin or nutbelow. l

Theupper dogs, C', have also shanks cabored out and screw-threads cuttherein, through which the clamping-screws pass, which, according to thedirection in which they are turned, draw together or move apart thedogs.

The dogs project through beyond the front vertical surface of thestandard, as seen in Figs. Il and III, and are beveled to a sharp orknife edge from the outside, leaving the inner faces vertical, asclearly shown in Fig. V. This beveling has the effect as the dogs biteinto the block to cause them to draw from each other, so that as theblock is cut by the saw4 they not only prevent the block from springingtogether and pinching the saw, but have a tendency to spread vit apartin a manner to allow the saw to work freely and with little friction.

The front plate of the standard has vertical slots cut init, throughwhich the dogs project, which slots also act as guides and give lateralsupport to the dogs in their movement bythe clamping-screws.

The table A is also recessed to receive the lower dogs, into whichrecesses they enter to bring them below the plane of the table. Theserecesses also serve as guides and lateral supports to the lower dogs.The upper dogs are also connected together hy an `arched brace, E, whichgives them additional strength and support.

The clamping screws have journal-bearings near their upper ends in thetransverse rib F of the standard B, and have pinions G keyed upon theirupper ends, by which `they are turned.

block by the clamping-screws.

The block being placed upon the table, the turning of the hand-wheel H2in the proper direction will operate the clamping-screws and cause theupper dogs to move down until they strike the blocks, when the lowerdogs will.-

1no\'e upward until they also strike the block, after which the furtheroperation of the clamping-screws will cause them all to bite into theblock equally and in a manner to hold the block rmly in place to bepresented to the action of the saw. As the saw cuts into the block t-hedogs, as before stated, will prevent (there being one on each side ofthe saw at top and bottom of the block) the block from springingtogether and allow the saw to revolve freely and without friction orbinding. After the block is divided, the reverse motion of thehand-'wheel releases the hold ot' the dogs upon the block and it is freeto be removed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The combination of two pairs of dogs, C C', with the reciprocating tableA, said dogs being so arranged as to clamp the block above and belowupon each side of the saw-kerf in a manner to prevent the block frompinching or binding the saw, when constructed and operatingsubstantially as set forth.

GHAS. L. PIERCE.

Witnesses:

W. H. FoRBUsH, GEO. W. WALLACE.

